Elevator



(No ModeL) U. P. SMITH.

ELEVATOR.

Ummm 'grati-:s

Pairlrvrf trice.

,UZZIEL I. SMITH, OF CHICAGO, ILLINOIS.

ELEVATOR.

SPECIFICATION 'forming of Letters Patent No. 314,736, dated March 31,1885.

Application filed September' 4, 1884. (No model.)

To all whom it may concern..-

Beit known that I, UZZIEL l). SMITH, a citizen of the United States, andresiding at Chicago, inthe county of Gool; and State of Illinois, haveinvented certain new and useful Improvements in Elevators, which arefully set forth in the following specification, reference being had tothe accompanying drawings, in which- Figure l represents a frontelevation of the elevator mechanism; Fig. 2, a sectional view on theline .fr .fr of Fig. l; and Fig. 3 a sectional view on the liney y, Fig.1.

My invention'rel'ates to elevators for buildings and other hoistingapparatus, being intended more particularly for application topassenger-elevators, especially for those used in private residences.

I will proceed to describe the construction and operation of an elevatorembodying my invention as it may be carried out practically in one way,and will then point out definitely in the claims the specialimprovements which I believe to be new and wish to protect by LettersPatent. Y

In the drawings, A represents an elevatorwell of any usual construction,in which the car I3 is suspended by means of ropes c from drums C on thedrum shaft C. This drumshaft may be operated by any suitable means toraise and lower the car, and has near each end a pinion, c.

Arranged below the shaft C is another fixed shaft, D, on which arearranged at each end a pair of drums, E E', revolvingloosely thereon.Each drum E has an external gearing, c, to mesh with one of the pinionsc', and an internal gearing, e', to mesh with two small pinions, f,fixed on the inner face of the drum E.

On the shaft D, between the two drums, is fixed a gear, F, which mesheswith the pinion f, as shown in Fig.2. From each pair of drums a rope, G,passes around a pulley, g, on top of i the car B, the' rope having itsends secured to and wound in opposite directions around the two drums EE.

The operation of the device is as follows: Upon rotation of the shaft Cin one direction, the carB will be lowered. At the same time the drums Ewill be rotated by means of the pinions c', and thereby pay off the ropeG as the car descends. By means of the pinionsf, which mesh with-theinternal gearing, e', on the drum E, and also with the fixed gearing F,the drum E will be rotated in the same direction as the drum E, but at aslower rate. rlhe drum E takes up the rope G, but, owing to its slowerrotation than the drum E, does not take it up as fast as the latterpasses it off, the relative proportion of the gearing being such thatthe increase in the amount of slack of the rope G is equal to the amountof rope cthat is paid out. Upon rotating the shaft G in the oppositedirection, the movement of the two drums is reversed to take up theslack in the rope G as thecar ascends in an obvious manner. In case themain hoisting apparatus gives way, the whole weight of the car is thrownupon the ropes G at the point where they pass around the pulleys g, andwill tend to unwind this rope from each of the drums E E', but thistendenoy is resisted by the gearing connecting the two drums, whichprevents their rotating in opposite directions, which operation would benecessary for the simultaneous unwinding of the rope from both drums.The pinionsf lock between the internal gear, e', on the drum E and thefixed gear F on the shaft D. It will be seen that the weight of the carthus sets this train of gears and prevents any further descent.

The safety device described above may be applied to different styles ofelevators, and I do not limit myself to its application in the precisemanner explained above, nor to the precise details of constructionherein described and shown.

It is evident instead of two sets of drums only one may be employed; butI deem the former construction preferable, and more than two may beused. It is also evident that only one pinion, f, may be employed 5 butthe construction shown is preferred as being stronger and betterpreserving the balance of the apparatus;

apparatus shown may be omitted entirely, and the car may beraised andlowered by operating the ropes G by hand, and I contemplate such anapplication of my device.

Having thus described my invention, what It is also obvious that thehoisting 9 I claim as new, and desire to secure by Letters Patent, is

' 1. The combination, with the ear and a suitable hoisting apparatus, ofone or more pairs of drums connected with the elevator by a rope Woundaround them in opposite directions, one of said drums being operatedfrom the shaft of the hoisting apparatus, and having an internal gearmeshing with one or more pnions mounted on the other drum between saidinternal gear and a fixed gear between the drums, substantially as andfor the purposes set forth.

2; The safety attachment for elevators, vconsisting of the drums E E',the former having external gear, e, and internal gear, e', and thelatte'rh'aving a'pinion or-pinion's, f arranged to gear with thefinternal gear, e', on the former and with a l'fixed gear, F, betweenthe two drums, substantially as yand for 4the purposes set forth.

3.` The combination, with the ear B, having pulleys g, of the drums EE', connected therewith by ropes G passing around said pulleys and woundon said drums in opposite directions, the said drums being connected bypinions on the one gearing with an internal gear on the other, and witha fixed gear between the two, substantially as and for the purposesspecified.

4. The combination, with fixed shaft D, of

'drums E E', mounted loosely thereon. and having internal gear, e', andpinions Yf, respectively, and of gear F, fixed on said shaft between thearms, substantially as and for' the purposes specified.

IRVINE MILLER, GARLOTTA LITTLE.

